Seicosy Birdhouse Ultrasonic Bark Controller, Outdoor Pet Dog Bark Stopper (Black) Designed for easy hanging or mounting on a tree,wall or fence post to keep your own dog or your neighbors dog from barking. Safe and effective for all size and breeds of dogs.This device with battery operated. Detects barks up to 50 feet with the use of an internal microphone and 4 levels of operation including a test mode. Durable and weatherproof for outdoor use. Uses ultrasonic sound to deter unwanted barking. Material: PP Plastic, Color: Black/Brown, Product Size: 11*11*14cm, Weight: 262g